Merge "Animate SplitPlaceholderView when entering split from overview" into sc-v2-dev am: f2af895b20 am: 092efed8d7

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15081296

Change-Id: I6091d6c30f9392cb15566ef6eab00c57505bf0ef